What kind of water is used for applying window film?
2 Answers
Lubricating water. It is tap water mixed with dishwashing liquid. Some also use neutral soapy water. Below are the relevant details: Purpose of spraying water: Spraying water serves as a lubricant, allowing the film to be adjusted to the correct position without misalignment. Once the film is properly positioned, the installer will use a squeegee to remove the water. Since the surface of the car window is smooth, no water stains will be left, ensuring a clean finish. Precautions: When applying the film, always place towels under the car window glass and on the dashboard to prevent water stains from seeping in.
The water used during film application isn't ordinary tap water. Having applied films to hundreds of vehicles over the years, I always use purified water mixed with a neutral dishwashing detergent. The specific ratio is 3-5 drops of detergent per liter of water, stirred until foamy. This soapy solution is exceptionally slippery, allowing the film to glide freely on the glass for positioning while making it easier to squeeze out air bubbles with a squeegee. The water must be absolutely clean - our studio uses bottled purified water because calcium and magnesium ions in tap water leave white marks when dried. After application, wait 2-3 days for the moisture to evaporate naturally, and the film will adhere firmly to the glass. Beginners often make the mistake of using tap water with laundry detergent - that high alkalinity corrodes the adhesive layer, causing bubbles within six months.
